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An efficient frequency domain soft interference cancellation (FD-SIC) scheme is proposed for turbo frequency domain equalization (FDE) in multiple-input multiple-output (MIMO) system. At the transmitter, vertical-bell laboratory layered space-time (VBLAST) is suitable for multiple modulation and coding scheme (MCS) on different antennas, which can also enhance channel capacity. At the receiver, inter-antenna...
A novel Frequency Domain Turbo Equalization (FD-TE) is proposed in multiple input multiple output (MIMO) systems, in which equalization is executed on Single Frequency Tone (SFT). It is proposed that received data from all receive antennas on one frequency tone are considered jointly, and then minimum mean square error (MMSE) equalization is implemented. This algorithm can reduce the calculation complexity...
In this paper, a novel effective low-complexity single carrier frequency-domain equalization SC-FDE scheme in multiple-input multiple-output (MIMO) system is introduced under frequency selective channel. It contains the advantages of SC-FDE and the complexity decreasing in MMSE algorithm by frequency-domain QR (FD-QR) decomposition. Also a rearrangement is implemented according to signal to noise...
In this paper, we consider an Orthogonal Frequency Division Multiplexing-Code Division Multiplexing (OFDM-CDM) system. The noise reduction method based on Least Squares (LS) is introduced into the OFDM-CDM receiver to improve the signal-to-noise ratio (SNR), while the system does not work under full load. In this paper, Walsh code is considered to be used in CDM module. The relationship between the...
In high-speed downlink packet access (HSDPA) mode of TD-SCDMA system, high speed downlink traffic channel and some associated control channels are shared by all user equipments (UEs). This shared mechanism causes feedback problem for scheduling, so some scheduling algorithms (for example proportional fair) are not applicable any more. In this paper, an improved scheme is proposed to accommodate to...
Both adaptive beam-forming antenna (ABA) and joint detection (JD) are key techniques in the LCR (low code rate) TD-CDMA system. ABA is adopted to suppress multi-path fading with antenna diversity and to increase system capacity by using digital signal processing (DSP) algorithms and dynamically generating the beam patterns, while JD can be used to reduce multiple-access interference (MAI) and inter-symbol...
A MIMO system named Turbo-BLAST was introduced recently. We investigate the structure of Turbo- BLAST, and study its three kinds structures using different channel codes. Some necessary deductions and new structures are proposed: the decoding algorithm of trellis coded modulation (TCM) is modified to provide the detector with extrinsic information, and a new decoder structure for Turbo code is also...
Dynamic channel allocation is an important part of RRM (radio resource management) in TD-SCDMA systems. It consists of slow DCA and fast DCA. In this paper, the fast DCA in CAC procedure is studied, several algorithms are proposed. The performance of each algorithm is simulated; meanwhile, comparisons and analysis are given
The multiuser transmission (MUT) is an effective way to eliminate the multiple-access interference (MAI) and the inter symbol interference (ISI) in the downlink channel of TDD-CDMA. In this paper, a novel MUT model is developed. In the model, the MUT combined with smart antennas (SA) is taken to improve the performance of TDD-CDMA in the spatial-temporal channel. Two different MUT algorithms in conjunction...
In order to combat multipath fading in the wireless networks and increase the system capacity, the idea of space-time coding devised for multiple antenna systems is applied to the two-hop non-regenerative (NR) relaying system. The proposed cooperative relaying system (CRS) is based on two-hop protocol, in the 1st hop the transmitter encodes original information into distributed linear dispersion codes...
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